On Sun, 3 Apr 2011 07:34:19 -0700, "William Sommerwerck"
wrote:

Actually, modern microwaves are more tolerant. You can put a metal tray in a
microwave, and nothing bad will happen.

Yep. Some come with metal racks:
http://en.wikipedia.org/wiki/File:Microwave_metal_shelf.JPG
As long as there is something inside the oven cavity that will ABSORB
the RF power, it's safe. Take away the absorber, such as with an
empty microwave oven, and the resultant standing waves will build up a
sufficiently large field to initiate arcing.

Of course, put anything, except food, in a microwave oven, and your
warranty is torched.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558